2022/02/10 (Thursday)
- Lab in-personnel: Matt, Giulia, Nikki, Shubham
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board+extra_board/nothing → Side2-readout HVboard CONN1/2/3 → HV1/2 → DCRC55(1)/50(3) Lead shield in place. Am Source y = 30.03 mm |
| Testing Side2-readout HV board | |
| 0900 | Goldman = 38.4 mK and stable. |
| 0900 | Set all QET biases based on yesterday's mini-IbIs and looked at pulses. DCRC1pA pulses looked weak so re-did IbIs: got QETbias = 212.8 (for dP/dI=1uV). This is much lower than yesterday's 244.7 uA, and reduces the tension with previous IbIs results that made it look like the DCRCs are swapped. I noted this morning that the tension is only apparent in two channels: cable1pA and cable3pA. It still looks like it might make more sense if these were swapped. |
| 1000 | Adjust driver offsets so baselines ~ -0.9 V |
| 1010 | Ramp HV up to 113.0V using RootSequencer. This is prebias |
| 1016 | After 5 minutes ramp HV down to 98.36 V |
| 1018 | Start 98.36 V data series after 5 min 15% prebias, 40 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pA threshold 20. Start series with the Start Button. |
| 1100 | After stopping series dial HV down to 0.0 V using RootSequencer |
| 1150 | Double-click Arduino Bridge link on desktop. Establish contact with Arduino, remotely. Temperature spike as usual. |
| 1154 | Do mvNwait +4steps×455 times, 40 second wait, with dwell = 40 and power = 6.8 V. (Around 5.93 mm/hour) This sequence will take 5hr3min20sec and will move the source a total distance of 30.00 mm ending at y = 0.03 mm. Should end at 4:57 pm. Tower temperature averages around 0.52 K with familiar oscillations. |
| 1225 | Goldman/Tower/MC(H35)/Coldplate = 520/1820/187/243 mK, Still = 1.32 K / 0.130 mbar / 0 mW, G1/G2= 298/282 mbar, 1K Pot = 1.58 K / 10±1 mbar, MB = 70.7% |
| These are of course very different from normal because we're using the source mover. | |
| 1411 | Fill LN2 cold trap bath. |
| 1755 | Turn on DCRC1 LEDs with rep rate reduced from 5000 to 500. Turn off LEDs after 3 minutes. Goldman peaked at 1.24 K. |
Analysis observations for today's data:
- It's harder to distinguish the 14 keV peak than in previous data, easier if you plot in INT-versus-OF space, can do a correction
- can get a good spectrum by histogramming PTINTall/PTOFamps - pretty weird. Seems pulse shape is a better energy metric than OF or integral.
- also get pretty beautiful spectrum by histogramming PTWKf40-PTWKr40 (pulse width). Amazing!
- Side2pB (DCRC3pA) timing seems to have shifted halfway through the series, need to investigate further
- Using same techniques as before, looks like noise width is
only 2.5 eVee- wow.- no - redid this, got 5.18 eV